Calendering-roll



(No Model.)

G. DUNN.

I OAL BNDERING ROLL. No. 324,758. Patented Aug. 18, 1885.

N. PEYERS, PhulmLllhngmpMr. Wuhmglcn. I10.

nrrnn STATES PATENT OFFICE GEORGE DUNN, OF MIDDLETOl/VN, OHIO, ASSIGNOR OF ONEHALF 'IO LOB- DELL GAR WVHEEL COMPANY, OF WVILMINGTON, DELAWVARE.

CALENDERlNG-ROLL.

SPECIFICATION forming part of Letters Patent No. 324,758, dated August 18, 1885.

Application filed March 30, 1885.

To all whom it may concern:

Be it known that I, GEORGE DUNN, a citizen of the United States, and a resident of Mich dletown, Butler county, Ohio, have invented certain Improvements in Galendering-Rolls, of

which the following is a specification.

My invention consists of an improvement in calendering-rolls for paper-making, my improvement being designed to prevent wrinkling, cutting, or breaking of the paper web during the process of calendering.

The View in the accompanying drawing is an elevation of a set of calendering-rolls, the frame being shown in section.

A and A are a series of calenderingrolls, the lowermost roll having journals adapted to bearings in the side frames, B, and above this are arranged a number of rolls, one over the other, to any desired number, the journals of these rolls being guided in the vertical side frames, B. The uppermost roll, D, of the series constitutes the feedroll, and around this roll and between it and the next one below, the paper enters the machine to be calendered.

As the paper is drawn into the calendering machine it is subjected to considerable strain, and unless the tension is perfectly uniform, and the paper has sufficient strength to stand the strain, it is apt to break in its 0 journey between the rolls. To prevent this breaking orwrinkling of the paper, and to provide for the requisite uniform tension, I construct the top roll, D, as shown in the drawing that is, I make the roll at the ex treme ends slightly greater in diameter than throughout the rest of its intermed ate length,

(No model.)

of paper and give a certain tension to it, but

will not nip itin the same way asifthe roll were resting on the next one below throughout its entire length. Owing to this lesser diameter there is a certain amount of lost motion, and the Web of paper is drawn firmly back from the point where the first pinch of the roll draws the paper web into the calendering-rolls below under heavy pressure, and thus there is created a positive tension on the paper web in close contact with the face of the second roll Without injury of the sheet.

I claim as my invention A set of calendering-rolls provided with a feed-roll having its ends slightly larger in diameter than its intermediate portion over which the web of paper passes, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE DUNN.

Witnesses:

J AS. V. BONNELL, JOHN WoLvER'roN. 

